How a Services Router Initializes USB Modems

When you connect the USB modem to the USB port on the Services Router, the router applies the modem AT commands configured in the init-command-string command to the initialization commands on the modem. For more information about configuring modem commands for the init-command-string command, see Modifying USB Modem Initialization Commands.

If you do not configure modem AT commands for the init-command-string command, the router applies the following default sequence of initialization commands to the modem: AT S7=45 S0=0 V1 X4 &C1 E0 Q0 &Q8 %C0. Table 24 describes the commands. For more information about these commands, see the documentation for your modem.

Table 24: J-series Default Modem Initialization Commands

When the Services Router applies the modem AT commands in the init-command-string command or the default sequence of initialization commands to the modem, it compares them to the initialization commands already configured on the modem and makes the following changes:

• If the commands are the same, the router overrides existing modem values that do not match. For example, if the initialization commands on the modem include S0=0 and the router’s init-command-string command includes S0=2, the Services Router applies S0=2.
• If the initialization commands on the modem do not include a command in the router’s init-command-string command, the router adds it. For example, if the init-command-string command includes the command L2, but the modem commands do not include it, the router adds L2 to the initialization commands configured on the modem.